rails                   
                                          
                                          
  
                                          
  
                                          
                                          
 trains  are  so  constructed  that  they 
 have to  follow a set path. this path is 
 called a "railway",  which  is comprised 
 of two metal rails, hence its  nickname. 
                                          
 because  the  low  friction  between the 
 wheels of  the train and the rail metal, 
 there  are limits for how acute a  curve 
 can  be, and  even more so for  how much 
 the  ground  under  the  rails  can   be 
 sloped.  thus a railway is often not led 
 on top of hills,  rather through them in 
 tunnels  (if   they   are   large),   or 
            artificial chasms.            
                                          
 there will be  trees on the  side of the 
 rails,  but not too  close, or they will 
 be cut  down  by the  railway  janitors. 
 there  will  be  plains,  and  bodies of 
                  water.                  
                                          
 trains go  by  day and  by night.  along 
      the way, there is information       
 scattered,  often put on  top of  poles, 
 to be  interpreted by the train drivers. 
 different  parts  of  the  railway  have 
         different speed limits.          
                                          
 sometimes, trains have to stop  and wait 
 for something to happen, far away.  this 
 is signaled  by  red  or  green  lights. 
                                          
                                  
                                          
 many people follow  the rails  by  foot. 
 often  this proves  to  be  the  shorter 
 path between two  points.  however  this 
 is  frowned  upon,  and  very   impolite 
         toward the train drivers!